Door-check.



No. 642,5!4. Patented Ian. 30, I900.

' N. U. BOND.

DOOR CHECK. (Application filed Nov. (5, 1899.)

(No Model.)

avwemlioz UNITED STATES PATENT OFFICE.

NATHAN O. BOND, OF HYANNIS, MASSACHUSETTS.

DOORHCHECK.

SPECIFICATION forming part of Letters Patent No. 642,514, dated January 30, 1900.

Application filed November 6, 1899. Serial No. 735,995. (No model.)

To all whom it may concern:

Be itknown that I, NATHAN O. BOND, a citizen of the United States, residing at I-Iyannis, in the county of Barnstable and State of Massachusetts,have invented certain new and useful Improvements in Door-Checks; and I do declare the following to be a full, clear, and exact description of theinvention,such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a partof this specification.

My invention relates to improvements in door-checks; and it consists in the combinations and arrangements hereinafter specified.

The device is illustrated in the accompanying drawings, in which- 7 Figure 1 isa plan view of my device as applied to a door. Fig. 2 is a similarview with the top of the casing broken away in order to show the operating parts. Fig. 3 is a plan from beneath of the upper part of the casing. Fig. i is a plan view of the casing and inclosed mechanism, the top of the casing being broken away to expose the mechanism within. Fig. 5 is a detail of the rotary friction-plates. Fig. 6 is a sectional view on line 6 6 of Fig. 4; Fig. 7, an underneath plan of the rotary frictionplates,the spindle on which they are mounted, and the ratchet mechanism which controls its action; and Fig. 8, aview of a modified form of the friction-plates.

Referring to the drawings, A is a casing, preferably made in two parts a a, the upper one, a, being provided with a depending circular flange a and with a downwardly-depending inclosiug rim a slotted or cut away to permit the movement of a lever L, as will be hereinafter described. The upper part of the casing is provided with brackets a a, by which it is secured to the door-casing. WVithin the circular flange c and between the upper and lower plates of the casing is pivoted a short spindle B, provided at its bottom with a pinion C, to which is secured aratchet D, mounted loosely upon the spindle B, and resting upon the ratchet D is a disk E, which carries upon its lower surface a pawl F, adapted to engage the ratchet and held against the same by a spring G. To the upper side of the disk E is secured an oppositely-curved spring H, which carries at its outer ends a pair of curved friction-plates I, adapted to rotate within the circular flange (t the curvature of the spring being such that the plates are normally out of contact with the flange. The plates I may be provided with rubbers or pads M, as shown in Fig. 4; but this is not essential.

Mounted upon a second spindle K, adjacent to the parts described, is a sector K, adapted to intermesh with the pinion C. The sector K overlies the end of the operating-lever L, which is pivoted upon the same spindle and has a projection l, which is held between a lug 7a and a spring carried in the under side of the sector K in such manner as to re lieve the parts from sudden strain or jar and form a yielding connection between the parts. The outer end of the lever L projects through the slot in the casing and is pivoted to a link M, which is in turn pivoted to any suitable bracket N, carried by the door.

The action of the device is as follows: Upon the opening movement of the door the link M causes the lever to move and through the sector K rotate the pinion O and the ratchetwheel, the pawl permitting a practically free movement in this direction. Upon the closing movement of the door, however, the pawl engages the ratchet and causes the disk, the attached spring, and the curved friction-plates to revolve rapidly. This movement causes the friction-plates to be thrown outward by centrifugal force against the tension of the springs upon which they are mounted and to make contact with the inner surface of -the circular flange, and thereby check the toorapid movement of the door. B y 'the relative arrangement of the axes on which swing the door, the lever L, and the link M the friction applied in opposition to the closing of the door increases as the door approaches closed position. In the closing of the door the outer end of the lever L through the link M receives a movement owing to the travel of the pivot of the link M with the door plus a movement owing to the swinging of the link M about its pivot. At the beginning of the closing movement of the door the link M being at quite a large angle to the lever L has very little movement about its pivot; but as the door approaches closed position the link and lever come into line with each other, and the lever receives the full swinging movement of the link M in addition to that of the door, so that its motion, and consequently the opposition to the closing of the door, is much greater than at the commencement of the closing movement.

It is obvious that changes can be made in the arrangement of parts without departing from the essence of the invention. For instance, the friction-plates maybe pivoted, as shown in Fig. 8, and retained out of contact by spiral springs, the action being similar in each instance.

Having described, my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a door-check, the combination of a part having an internal, annular surface, a shaft carryingaspring, parts mounted on said spring and adapted to be forced against such surface by the rotation of said shaft to produce friction, and means for rotating said shaft by the movement of a door, substantially as described.

2. In a door-check the combination of a casin g, a circular flange carried thereby, frictionplates adapted to rotate upon a spindle within said flange, a spring upon which said plates are mounted, a disk to which said spring is secured, a pawl carried by said disk by which it is caused'to rotate with a ratchet underlying the disk, a pinion secured to said ratchet, a pivoted sector adapted to intermesh with said pinion, a lever by which said sector is moved, and a link by which said lever is attached to a door, substantially as described.

3. In a door-check the combination ofa sector connected by a lever and a link to a door and moved thereby, a pinion with which said sector intermeshes, a ratchet connected to said pinion, a disk underlying said ratchet and concentric therewith, a pawl by which said ratchet and disk are connected, a spring carried by the disk, friction-plates carried by said spring and normally held therebyin positions toward the center of the disk, and a circular flange within which said plates are adapted to rotate and against which they are adapted to rub, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

NATHAN O. BOND. Vitnesses:

W. B. AOKER, M. J. Moonn. 

